webrtc,人脸拍照小功能

来源：互联网发布：林忆莲知乎编辑：程序博客网时间：2024/05/01 19:14

<!DOCTYPE html>  <html>      <head>          <meta charset="utf-8">          <title>学习webrtc-chapter2:get user media</title>  <style>video,canvas{border:1px solid gray;width:400px;height:400px;border-radius:50%;}</style>    </head>      <body>          <video autoplay></video> <canvas id="myCanvas"></canvas><button id="capture">拍照</button><script src="photobooth.js"></script>     </body>  </html>

function hasUserMedia(){//判断是否支持调用设备api，因为浏览器不同所以判断方式不同哦  return !!(navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia);  }  if(hasUserMedia()){  //alert(navigator.mozGetUserMedia)  navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;  var video=document.querySelector("video");  var canvas=document.querySelector("canvas");var streaming = false;navigator.getUserMedia({  video:true,//开启视频  audio:false//先关闭音频，因为会有回响，以后两台电脑通信不会有响声  },function(stream){//将视频流交给video  video.src=window.URL.createObjectURL(stream);   streaming = true;},function(err){  console.log("capturing",err)  });  document.querySelector("#capture").addEventListener("click",function(event){if(streaming){//alert(video.clientHeight)//canvas.width = video.clientWidth;//canvas.height= video.clientHeight;canvas.width = 800;canvas.height = 800;var context = canvas.getContext('2d');context.drawImage(video,20,20)}})}else{  alert("浏览器暂不支持")  }

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